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@ 2018-02-06T10:57:03Z

<?php
    
    $arr1 = Array(
        "2" => Array
            (
                "quantity" => 2,
                "id" => 2
            ),
    
        "1" => Array
            (
                "quantity" => 1,
                "id" => 1
            ),
    
        "3" => Array
            (
                "quantity" => 1,
                "id" => 3
            ));
    
    $arr2 = Array(
        "0" => Array
            (
                "id" => 1,
                "name" => "2Bed Room",
                "room" => 6,
                "bed" => 12,
                "price" => 2800,
                "available_room" => 6,
                "available_bed" => 12,
                "extra_bed" => 500,
            ),
    
        "1" => Array
            (
                "id" => 2,
                "name" => "3Bed Room",
                "room" => 12,
                "bed" => 36,
                "price" => 3800,
                "available_room" => 12,
                "available_bed" => 36,
                "extra_bed" => 500,
            ),

        "2" => Array
            (
                "id" => 3,
                "name" => "Dormitory",
                "room" => 8,
                "bed" => 16,
                "price" => 750,
                "available_room" => 8,
                "available_bed" => 16,
                "extra_bed" => 500,
            ));
    
    $arrone = array_column($arr1, "quantity", "id");
    $arrtwo = array_column($arr2, "price", "id");
    
    foreach($arrone as $key => $val){
        $total[$key] = $arrtwo[$key] * $val;
    }
    
    var_dump($total);

Output for 5.6.38 - 5.6.40, 7.0.33, 7.1.0 - 7.1.31, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: array(3) { [2]=> int(7600) [1]=> int(2800) [3]=> int(750) }

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